Honda Outboards BF40A/BF50A Service Manual, Page 50Get this manual
HONDA BF36A45A
VALVE CLEARANCE
Valve clearance inspection and adjustment must be performed with the engine cold1) Remove the engine cover
2) Move the shift lever to "N" position3) Remove the four 25 mm flange bolts and three mm plain washers from the flywheel cover4) Remove the flywheel cover